<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>新增属性</title>
    <style>
    </style>
</head>
<body>
    <header>我是头部</header>
    <footer>我是底部</footer>
    <aside>我是侧边栏</aside>
    <article>我是文章
            <hgroup>
                <h1>一级标题</h1>
                <h2>二级标题</h2>
            </hgroup>
            <section>第一段</section>
            <section>第二段</section>
            <section>第三段</section>
    </article>
    <nav>我是导航栏
        <ul>
            <li>1</li>
            <li>2</li>
            <li>3</li>
            <li>4</li>
            <li>5</li>
        </ul>
    </nav>
</body>
</html>